package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

@Aspect
@Component
@Slf4j
public class AutoFillAspect {

    /*
    * 切面切入点*/
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void pointCut(){}

    @Before("pointCut()")
    public void AutoFill(JoinPoint joinPoint){
        // 获取数据库的操作类型
        // 获取方法签名对象
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();
        // 获取注解上的value值
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);
        // 获取数据库的操作类型
        OperationType operationType = autoFill.value();

        // 获得实体对象
        Object[] args = joinPoint.getArgs();
        //判断实体对象是否为空值
        if(args.length  == 0)
        {
            return;
        }
        // 获得第一个实体对象
        Object entity = args[0];

        // 为实体对象赋值
        LocalDateTime now = LocalDateTime.now();
        Long currentId  = BaseContext.getCurrentId();

        // 判断数据库的操作类型
        if(operationType == OperationType.INSERT){
            try {
                // 为四个公共字段赋值
                Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

                // 通过反射赋值给公共字段
                setCreateTime.invoke(entity, now);
                setCreateUser.invoke(entity, currentId);
                setUpdateTime.invoke(entity, now);
                setUpdateUser.invoke(entity, currentId);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }else if(operationType == OperationType.UPDATE){
            // 为两个公共字段赋值
            try {
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

                // 通过反射赋值给公共字段
                setUpdateTime.invoke(entity, now);
                setUpdateUser.invoke(entity, currentId);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }

    }

}
